Lithuanian aiškus

← Old Church Slavonic ꙗснъ (cognate)

← Old Church Slavonic рѣснъ (cognate)

← Proto-Balto-Slavic *aiˀṣk- (derived)

← Lithuanian raiškus (cognate)

← Latvian īsts (cognate)

← Russian искра (cognate)

← Proto-Slavic *ěsnъ (cognate)

→ Lithuanian riba (mention)

→ Lithuanian laukas (mention)

→ Lithuanian aiškinti (affix)